Not a huge fix here - I just patched in the beginning of Scarlet Begonias from the Ladner FOB on archive.org (shnid 8324). The patch source was pitch and volume matched, as well as crossfaded with the SBD. The transition from AUD to SBD is very hard to detect.
Nonseekable shns were converted to flac, SBEs were cleaned up using shntool. All edits done in CE Pro.